CVE-2026-18909

Stack‑based Buffer Overflow in ELAN Smart‑Pad Driver Causes BSOD

Published Aug 6, 2026 CVSS 4.0 · 5.6 Medium EPSS < 1% KEV · Not listed
Description
A stack-based buffer overflow vulnerability exists in ELAN Microelectronics Corp. ELAN Smart-Pad on Windows (ETD.sys and ETDSMBus.sys). During Intel SMBus recovery, ETDSMBus.sys does not enforce an upper-bound check on the hardware-derived report count, allowing an out-of-range value to be forwarded to ETD.sys where it is used as a loop counter for a stack buffer copy without destination size validation. A local attacker with standard user privileges can trigger a kernel bugcheck (BSOD 0xF7 DRIVER_OVERRAN_STACK_BUFFER), resulting in denial of service. This issue affects ELAN Smart-Pad through ETD24.21.52.3.

Remediation

Vendor Solution

Update to ETD driver version to ETD24.21.53.3 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Elan Microelectronics Corp.
Elan Microelectronics Corp. elan Smart-pad
Vendors & Products Elan Microelectronics Corp.
Elan Microelectronics Corp. elan Smart-pad
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Stack‑based Buffer Overflow in ELAN Smart‑Pad Driver Causes BSOD
Type Values Removed Values Added
Description A stack-based buffer overflow vulnerability exists in ELAN Microelectronics Corp. ELAN Smart-Pad on Windows (ETD.sys and ETDSMBus.sys). During Intel SMBus recovery, ETDSMBus.sys does not enforce an upper-bound check on the hardware-derived report count, allowing an out-of-range value to be forwarded to ETD.sys where it is used as a loop counter for a stack buffer copy without destination size validation. A local attacker with standard user privileges can trigger a kernel bugcheck (BSOD 0xF7 DRIVER_OVERRAN_STACK_BUFFER), resulting in denial of service. This issue affects ELAN Smart-Pad through ETD24.21.52.3.
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 5.6, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:P/AU:N/R:U'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
ELAN
Published
Updated
Aug 6, 2026, 2:19 PM
Reserved
Aug 5, 2026, 5:41 AM
Status
Awaiting Analysis
Published
Aug 6, 2026, 5:16 AM
Modified
Oct 23, 2026, 9:10 PM